Improvement in screw-cutting machines



3 Sheets--Sheet 1.

J. J. GRANT.

Improvement in Screw- Cutting Machines.

3Sheets--S heet2 J. J. GRANT.

lmprovement in Screw-Cutting Machines. NO. 133,O26. Patented Nov.l2,872.

3Shets--Sheet3.

J. J. GRANT.

lmprovement in Screw-Cutting Machines.

N0. 133,026. Patented Nov.l2872.

ECOC) UNITED STATES PATENT C)FFICEQ JOHN J. GRANT, OF GREENFIELD, MASSACHUSETTS, ASSIGN OR T0 HIMSELF, S. L. WILEY, AND CHARLES P. RUSSELL, OF SAME PLACE.

IMPROVEMENT IN SCREW-CUTTING MACHINES.

Specificatoi1 forming part of Letters Patent No. 183,026, dated November 12, 1872.

T0 all whom it may concern:

Be it known that I, JOHN J AMES GRANT, of Greenfield, in the county of Franklin and State of Massachusetts, have invented an ImprovedMachine or Drillin g and Cuttin g Screw- Thrads and the following description, taken in connection with the accompanyng plate of drawin ghereinafter referred to, forms a full and exact specification, wherein are set forth the nature and principles of the invention, by Which the same may be distingnished from others of a similar class, together with such parts there of as a re claimed as new and are desired to be secured by LettersPatent of the United States.

My invention relates to that class of machines which are made use of E01 drilling and for cutting screwthreads on b0lts and nuts; and the {nature thereof consists, first, in the mechanism made use of for adjusting the dies and holding the same firmly in position, hereinafter shown and descr'bed. Second, in the apparatus used for operating the head-stock and pressing the same toward the shaft in 01- der 1:0 cause the dies te grip a bolt to be screwed 011 the tap to take hold of a nut, in whieh it is required to have a thread cut, as hereinafter specified. Third, in combinin g with the disk a reversible chuck-plate, so constructed as to hold nuts of dfi'erent sizes and shapes, and bring either thereof in position to be operated on with facility. Fourth, in the combination of parts eonst-ituting the mechanism, whereby the operator is enabled to adjust the feed in such a manner as to make it light 01 heavy, as may be required. Fifth, in combinin g with the feeding mechanism a yoke pro vided with sleeves, a work-holding chuck provided with a bevel-gear, and a bevel-gear in such a manner that the feed is operated by the same power which revolves the shaft, and the operatng gear is placed at the side of the machine.

In the aecompanyingplate of drawing, which illustrates my invention and forms a part of the specification thereof, corresponding parts are illustrated by similar letters.

Figure 1 is a view in perspective of a ma chine with my mprovements applied thereto.

Fig. 2 is a plan of the same. Fig. 3 is a view of the startng-lever,illustiating the same in detail. Fig. 4 represents the die-holding disk. Fig. 5 is an end view of the machine illustrating the feed mechanism. Figs. 6, 7, and 8 are views in detail of the nut-ehuck. Figs. 9, 10, and 11 illustrate, in detail, parts of the feed mechanism.

The eonstrnction, operation, and relative arrangement of the component parts of my macl1ine are as follows: The head-stock B, resting upon the shearsAof the machine, supports and constitutes the hearing of the tubu lar jonrnal or disk shaft, upon whichthe die-holding disk D can be rotated. Tl1e said disk, as will be clearly seen by reference to the dra-wing, is placed in an eccentric relation with the working center of the tool or werk-holding chuck F, carried by the tubular shaft H, and is provided with a proper number of circular apertures, which may be used either as open ings for the drill te pass through when werk is placed upon the face of the disk, to hold difierentsized dies (1 d, or support the nut holding ehuck J. The eccentric position 0ecnpi ed by the said disk allows of its being so rotated as to bringthe center of any one ofthe said apertures in line with the axis of the shaft H, thereby enabling the operator to accurate ly adjust any one of the several dies, 01 the nut-holding chuck into working postion op posite the tool or work-holding chuck F. The said disk maybe locked firmly in position after being thus adjnsted by means of the pink, which passes throngh an aperture out for its reception in the projection l, cast upon the headstock and fits aceurately in either of the cylindrical slots m. The pin is held in position bythe dog 0r clutch n, provided with a claw, 0 s0 constructed as to fit exactly within an annular slot cut upon the said pin. The dies d for cutting screw-threads are described and clamed in the specification forming part of Letters Patent N 0. 120,266, granted to me on the 24th day of October, 1871, and are oom bined with the said disk in substantially themanner specified in the said patent for fittng them to the die-stock. For this purpose the said disk is provided with an annular cavity with fernale screws fox the reception of the set-screwsp, which, together with the setscrews 1, operated upon the circurnference of the disk, may be screwed up te hold the dies in any position te which they are adjusted. B y means of the starting-lever S the headstock B is pressed up toward the work-holding chuck F, in order to bring the die against the end of the bolt te be screwed, and it is held there until the thread begins to take hold and the work feeds itself. The saidlever works upon a fixed fulcrum or bolt attached. to the head-stock, and is provided with a shoulder, 8 by means of whieh it is supported in pcsition when at rest. A paw, 8, is pivoted to the endof the lever, which catches in the raak upon the shears of the machine when the handle is raised, and causes the head-stock te move forward; but when the handle is allowed te fal1 the stud s en gages with the paw1 and causes it to rise and disengage itself entireiy from the rack in such a manner as to allow the head-stock te be moved in either direction with equa1 facility, er admit of its being entirely removed from the bed of the machine. lhe nut-holding chuck J is secured in a socket, T, provided with a tubular projection, t Which fits accurately in a circular aperture, t prepared for its reception in the disk D, where it is secured in position by a set-screw. One side of the said chuck is pro vded with a series of hexagonal recepta-cles cf different sizes, while the opposite side is 'urnished with cavities square in form, in 01- der that the implement may be adapted to nut s of varous shapes and sizes. Either side of the said chuck may be used with eqnal fa,- cility by merely reversing the position of the same in the socket, and it is.held in any desired position by means of the vertical springbolt v which fits accurately in the cylindrica1 slot 12 As some metals can be pieced with much greater rapidity and 'acility than others, the machine is provided with en ad.- justable eed mechanism, wh0se 1notion is perfect1y reguiar and even. For this purpose one end of the tubular shaft H, upon which revoives the toolholding chuck F, is provided with two or more can1s, h h, one or all of which may be made to engage with the reciprocating-bar w, as the operator may prefer, by properly adjnsting the casing w in which the said reciprocating-bar is secured by means of the miiled setscrew w, which works in an eiongated slot, w", out in the said easing, and is screwed into a bmcket attached to the yoke 00. The reciprocating-bar w is kept in con tact With the cam or cams by means of the spiral spring 10, and the length of its vibra tiens may be accnrately adjusted by the thmnb nut w It is provided with a paw1, w, which 'engages with the ratchet-wheel 3 The screw shaft 3 passes through a cylindrical aperture in the yoke zv, which consttntes a hearing for the same, and engages with a fen1aie thread cut for its reception in the standard 2. By this construction the traversing motion of the said yoke which regulates the feed may be accurately adjusted-that is to say, when the reciprocating-bar is made to engage with a single cam the pawl catehes in the teeth of the ratchet-wheel and turns the same a certain distance at one revoiution of the mandrel. If the said bar engages with two of the cams the wheel travels over the same distance at each ha1fa revolution and. if three cams are used, at each third of a revolution, and so on. The extent of the movement of the reciproca-ting-bar is adjusted hy the thurnb-nut 10 The sleeves 90' of the y0ke a: ciasp the tubular shaft H in such a manner as te impart longitudinal travel or 'eed to the wrk-holding chuck F upon the end thereof when the said yoke is moved by the ratchet-wheel. Both rotary motion and horizontal travel are imparted to the workholding chuck F by the bevel-geer F Which engages with bevel-geer F of the said chuek. The tubular shaft of the beve1- geer Frevolves upon a fixed journa1 rigidly attached to the said yoke, and is operate d as may be desirable.

This arrangement of the operating-gea-r is very advantageous and convenient, as the op erator is brought near his work, and long beits, which are passed through the tubular shaft H, are not in the way of the turning of the crank.

Having thus described the constrnction and operation of my invention, I will indicate in the following clauses what I claim and desire te secure by Letters Patent of the United States- 1. In a machine f0r driliing and cutting screw-threads, the apparatns made use of or adjusting the dies and. holding the same firm- 1y in position, consistng of the die-holding disk D provided With cylindrical s1ots m, the pin k npon which is cut an annuiar slot, the

projection l cast solid with the headstock B and providedwith a 0ylindrical aperture, and the dog n pivoted to the head-stock B, and provided With a c1aw, 0, all combined and operating together, as and for the purposes described.

2. 'lhe apparatus used for operating the head-stock B, consisting of the lever S provided with the shoulder 8 and stud 8 the pawl 8 pivoted to the end of said lever, and

the rack attached to the shears A, when 00m bined and operating together, as described.

3. The combination of the disk 1), the re versible chuck plate J, constructed as de scribed, the socket in which the said chuckplate is fitted, and the vertical spring-bolt, a1l constrncted and arranged as described.

1. The combination of the shaft H provided with two rm0re cams, h h, reciprocatingbar 20, adjustable oasng w having a slot, m spi- In testirnony that I claim the foregoing I ral spring w thumb-nut w pawl w, and the have hereunt-o set my hand and sea1 this 3d rafnchet-wheel y, substantially as and for the day of J uly, 1872.

purpose set forth.

5. In combination with the feeding mechani sm which forms the subject-matter of the preceding claim, the yoke xprovided with sleeve Witnesses: 00, the work-holdng chuck F provided with AUSTIN DEWOLF, a bevel-gaar, F and the bevel-gear F a11 op HANNAH F. REED. eratng together, as descrbed.

JOHN J. GRANT. [L. s.] 

